Work place appropriateness

Its really sad but we all have those individuals that work with us that say and do inappropriate things in the work environment. I am not talking about BIG inappropriate acts like sexual harassment or general harassment (although I am sure most of us have had to deal with that as well). I am talking about the people that sit next to us that say something that makes your spidey senses say "Please tell me I didn't JUST hear that".
My example for today is brought to you by the unusual woman who sits behind me. She has sat behind me for about 2 months and since she isn't in my department and our job functions don't cross mingle I've never really had a reason to strike up any type of conversation with her. Also I haven't really conversated because, well honestly she's just an odd duck and I'd prefer to NOT get involved. But I digress, this morning the lady who sits across from my neighbor said, "Oh that looks good, what are you having for breakfast?" to which my behind sitting coworker says "I am having my high fiber cereal and I like to mix with yogurt" now usually that would be where most of the population would cut off their commentary but NO fear not she continued with "Yeah you know have to eat it - gotta keep regular, keep everything flowing like it should". Could ya, could ya not? Please I mean could ya just NOT say that type of thing at work where I can hear. Please?